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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
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    <title>Document</title>
    <style>
        * {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .wrap {
            width: 300px;
            margin: 50px auto;
        }

        .list>ul {
            height: 300px;
            overflow: auto;
        }

        .list>ul ul {
            padding-left: 20px;
            display: none;
        }
    </style>
</head>

<body>
    <div class="wrap">
        <div class="selected"></div>
        <div class="list">
            <input type="text">
            <ul>
                <!-- <li>
                    <img src="img/close.png" alt="">
                    <input type="checkbox">
                    <span>山西</span>
                    <ul>
                        <li>
                            <input type="checkbox">
                            <span>太原</span>
                        </li>
                        <li>
                            <input type="checkbox">
                            <span>大同</span>
                        </li>
                    </ul>
                </li> -->
            </ul>
            <div><button>确定</button></div>
        </div>
    </div>
</body>
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</html>